ETSI TR 103 000-2-1-2002 接入和终端(AT).公共电话网的模拟接入.协调终端接口的标准的建议注释.第2部分:一般可用建议注释.第1子部分:发送频谱密度要求的修正 (版本1.1.1)
Access and Terminals (AT); Analogue Access to Public Telephone Network; Advisory Notes to Standards Harmonizing Terminal Interface; Part 2: Generally Applicable Advisory Notes; Sub-Part 1: Modification to Sending Spectral Density Requirements